title: Nocturnal activity in a diurnal rodent (Arvicanthis niloticus): the importance of masking.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm / Q000502:physiology*; D008027:Light; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D010470:Perceptual Masking; D017440:Photoperiod; D051381:Rats